﻿using System;

class PrintFirst10NumbersOfSequence
{
    static void Main()
    {
        for (int i = 1; i <= 10; i++)
        {
            int j;
            j = i+1;
            if ((j % 2) == 0)
                Console.WriteLine(j);
            else
                Console.WriteLine(-j);
        }
    }
}
